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      <a href="/2016/10/05/angular2-notes-2-create-login/" title="Angular2使用笔记2--创建登录页面" itemprop="url">Angular2使用笔记2--创建登录页面</a>
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      <a href="https://godbasin.github.io" title="被删">被删</a>
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    <time datetime="2016-10-05T00:49:32.000Z" itemprop="datePublished">2016-10-05</time>
    更新日期:<time datetime="2018-12-18T15:30:23.936Z" itemprop="dateModified">2018-12-18</time>
    
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			<strong class="toc-title">文章目录</strong>
		<ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#根据产品规划划分模块"><span class="toc-number">1.</span> <span class="toc-text">根据产品规划划分模块</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#主要页面逻辑"><span class="toc-number">1.1.</span> <span class="toc-text">主要页面逻辑</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#定义登录组件"><span class="toc-number">1.2.</span> <span class="toc-text">定义登录组件</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#添加路由"><span class="toc-number">1.3.</span> <span class="toc-text">添加路由</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#编写Login组件"><span class="toc-number">2.</span> <span class="toc-text">编写Login组件</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#添加模板"><span class="toc-number">2.1.</span> <span class="toc-text">添加模板</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#添加样式"><span class="toc-number">2.2.</span> <span class="toc-text">添加样式</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#定义Login组件"><span class="toc-number">2.3.</span> <span class="toc-text">定义Login组件</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#输出Login组件"><span class="toc-number">2.4.</span> <span class="toc-text">输出Login组件</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#结束语"><span class="toc-number">3.</span> <span class="toc-text">结束语</span></a></li></ol>
		</div>
		
		<p>最近在学习Angular2作为前端的框架，《Angular2使用笔记》系列用于记录过程中的一些使用和解决方法。<br>本文记录搭建登录页面的过程。<br><a id="more"></a></p>
<h2 id="根据产品规划划分模块"><a href="#根据产品规划划分模块" class="headerlink" title="根据产品规划划分模块"></a>根据产品规划划分模块</h2><hr>
<h3 id="主要页面逻辑"><a href="#主要页面逻辑" class="headerlink" title="主要页面逻辑"></a>主要页面逻辑</h3><p>在这里，本骚年就建一个比较简单的项目。该项目与之前的Angular使用笔记项目长得完全一致，但我们这里用React来实现吧。</p>
<ul>
<li>我们的主要页面逻辑如下：<ul>
<li>1.登录页面，输入账号和密码即可</li>
<li>2.模块页面</li>
</ul>
</li>
</ul>
<h3 id="定义登录组件"><a href="#定义登录组件" class="headerlink" title="定义登录组件"></a>定义登录组件</h3><ul>
<li>首先我们在app文件夹内添加一个login文件夹<br>ng2里面，我们使用与其他框架不同的目录组织方式，即将同个组件相关的文件放置在一个文件夹中，方便管理。</li>
<li>Login组件文件如下：<figure class="highlight cmd"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div></pre></td><td class="code"><pre><div class="line">login/</div><div class="line"> ├──index.ts                   * 导出该目录下组件</div><div class="line"> ├──login.component.ts         * 定义并导出Login组件</div><div class="line"> ├──login.template.html        * Login组件的html模板</div><div class="line"> └──login.style.css            * Login组件的样式文件</div></pre></td></tr></table></figure>
</li>
</ul>
<h3 id="添加路由"><a href="#添加路由" class="headerlink" title="添加路由"></a>添加路由</h3><ul>
<li>设置路由<br>打开app.roytes.ts，设置如下路由：</li>
</ul>
<figure class="highlight typescript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">import</span> &#123; RouterConfig &#125; from <span class="string">'@angular/router'</span>;</div><div class="line"><span class="keyword">import</span> &#123; Login &#125; from <span class="string">'./login'</span>;</div><div class="line"></div><div class="line"><span class="keyword">export</span> <span class="keyword">const</span> routes: RouterConfig = [</div><div class="line">  &#123; path: <span class="string">'login'</span>,  component: Login &#125;,</div><div class="line">  &#123; path: <span class="string">'**'</span>,    component: Login &#125;,</div><div class="line">];</div></pre></td></tr></table></figure>
<ul>
<li>主组件app.component.ts中添加路由输出</li>
</ul>
<figure class="highlight typescript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div></pre></td><td class="code"><pre><div class="line">template: <span class="string">`</span></div><div class="line"> &lt;main&gt;</div><div class="line">   &lt;router-outlet&gt;&lt;/router-outlet&gt;</div><div class="line"> &lt;/main&gt;</div><div class="line"> `</div></pre></td></tr></table></figure>
<p>从上面可以看到，Angular2中路由也是与组件一样导出该功能，具体的我们会在后面的文章中介绍。</p>
<h2 id="编写Login组件"><a href="#编写Login组件" class="headerlink" title="编写Login组件"></a>编写Login组件</h2><hr>
<p>前面也提到过，Login组件相关文件统一管理在login文件夹中。</p>
<h3 id="添加模板"><a href="#添加模板" class="headerlink" title="添加模板"></a>添加模板</h3><ul>
<li>添加该组件模板login.template.ts，如下</li>
</ul>
<figure class="highlight html"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div></pre></td><td class="code"><pre><div class="line"><span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">"container login"</span>&gt;</span></div><div class="line">    <span class="comment">&lt;!--(ngSubmit)为绑定表单事件--&gt;</span></div><div class="line">    <span class="tag">&lt;<span class="name">form</span> <span class="attr">id</span>=<span class="string">"login-form"</span> (<span class="attr">ngSubmit</span>)=<span class="string">"submitForm(name, password)"</span>&gt;</span></div><div class="line">        <span class="tag">&lt;<span class="name">h3</span> <span class="attr">class</span>=<span class="string">"text-center"</span>&gt;</span>login<span class="tag">&lt;/<span class="name">h3</span>&gt;</span></div><div class="line">        <span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">"form-group"</span>&gt;</span></div><div class="line">            <span class="tag">&lt;<span class="name">label</span>&gt;</span>account<span class="tag">&lt;/<span class="name">label</span>&gt;</span></div><div class="line">            <span class="comment">&lt;!--[value]绑定该组件作用域的值，而(input)用于处理输入事件，实现双向绑定--&gt;</span></div><div class="line">            <span class="tag">&lt;<span class="name">input</span> <span class="attr">class</span>=<span class="string">"form-control"</span> <span class="attr">type</span>=<span class="string">"text"</span> [<span class="attr">value</span>]=<span class="string">"name"</span> (<span class="attr">input</span>)=<span class="string">"name = $event.target.value"</span> <span class="attr">placeholder</span>=<span class="string">"username"</span> <span class="attr">autofocus</span> <span class="attr">required</span>&gt;</span></div><div class="line">        <span class="tag">&lt;/<span class="name">div</span>&gt;</span></div><div class="line">        <span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">"form-group"</span>&gt;</span></div><div class="line">            <span class="tag">&lt;<span class="name">label</span>&gt;</span>Password<span class="tag">&lt;/<span class="name">label</span>&gt;</span></div><div class="line">            <span class="comment">&lt;!--[value]绑定该组件作用域的值，而(input)用于处理输入事件，实现双向绑定--&gt;</span></div><div class="line">            <span class="tag">&lt;<span class="name">input</span> <span class="attr">class</span>=<span class="string">"form-control"</span> <span class="attr">type</span>=<span class="string">"password"</span> [<span class="attr">value</span>]=<span class="string">"password"</span> (<span class="attr">input</span>)=<span class="string">"password = $event.target.value"</span> <span class="attr">placeholder</span>=<span class="string">"password"</span> <span class="attr">required</span>&gt;</span></div><div class="line">        <span class="tag">&lt;/<span class="name">div</span>&gt;</span></div><div class="line">        <span class="tag">&lt;<span class="name">button</span> <span class="attr">type</span>=<span class="string">"submit"</span> <span class="attr">class</span>=<span class="string">"btn btn-default"</span>&gt;</span>登录<span class="tag">&lt;/<span class="name">button</span>&gt;</span></div><div class="line">    <span class="tag">&lt;/<span class="name">form</span>&gt;</span></div><div class="line"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></div></pre></td></tr></table></figure>
<h3 id="添加样式"><a href="#添加样式" class="headerlink" title="添加样式"></a>添加样式</h3><p>Angular 2应用使用标准的CSS来设置样式。这意味着我们可以把关于CSS的那些知识和技能直接用于我们的Angular程序中，比如：样式表、选择器、规则，以及媒体查询等。</p>
<p>在此基础上，Angular还能把组件样式紧紧的“捆绑”在我们的组件上，以实现一种比标准样式表更加模块化的设计。</p>
<ul>
<li><p>添加样式的方式</p>
<ul>
<li>元数据中的样式：给@Component装饰器添加一个styles数组型属性</li>
<li>模板内联样式：放到<code>&lt;style&gt;</code>标签中来直接在 HTML 模板中嵌入样式</li>
<li>元数据中的样式表URL：给组件的@Component装饰器中添加一个styleUrls属性来从外部CSS文件中加载样式</li>
<li>模板中的link 标签：在组件的HTML模板中嵌入<link>标签</li>
<li>CSS@imports：利用标准的CSS@import规则来把其它CSS文件导入到我们的CSS文件中</li>
</ul>
</li>
<li><p>控制视图的包装模式</p>
<ul>
<li>原生Native模式：使用浏览器原生的Shadow DOM实现来为组件的宿主元素附加一个Shadow DOM。组件的样式被包裹在这个Shadow DOM中</li>
<li>仿真Emulated模式（默认值）通过预处理（并改名）CSS代码来仿真Shadow DOM的行为，以达到把CSS样式局限在组件视图中的目的（默认选项）</li>
<li>无None：Angular不使用视图包装。Angular会把CSS添加到全局样式中。而不会应用上前面讨论过的那些局限化规则、隔离和保护等规则。 从本质上来说，这跟把组件的样式直接放进HTML是一样的</li>
</ul>
</li>
<li><p>特殊的选择器</p>
<ul>
<li>:host：使用:host伪类选择器，用来选择组件宿主元素中的元素 （相对于组件模板内部的元素）</li>
<li>:host-context：在当前组件宿主元素的祖先节点中查找CSS类， 直到文档的根节点为止</li>
</ul>
</li>
<li><p>添加该组件样式login.style.css，如下</p>
</li>
</ul>
<figure class="highlight css"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div></pre></td><td class="code"><pre><div class="line"><span class="selector-class">.login</span> &#123;</div><div class="line">    <span class="attribute">padding</span>: <span class="number">200px</span> <span class="number">20px</span>;</div><div class="line">&#125;</div><div class="line"></div><div class="line"><span class="selector-class">.login</span> &gt; <span class="selector-tag">form</span> &#123;</div><div class="line">    <span class="attribute">border</span>: solid <span class="number">1px</span> <span class="number">#999</span>;</div><div class="line">    <span class="attribute">padding</span>: <span class="number">20px</span>;</div><div class="line">    <span class="attribute">border-radius</span>: <span class="number">5px</span>;</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<p>不得不说，ng2中组件样式的作用域仅在于该组件内，真正做到了组件的解耦。<br>当然，我们查看元素的时候便可以发现，ng2通过给组件设定随机的代号属性来管理每个组件的样式，如图：<br><img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/F11E.tmp.png" alt="image"></p>
<ul>
<li>参考：<a href="https://angular.cn/docs/ts/latest/guide/component-styles.html" target="_blank" rel="external">组件样式</a></li>
</ul>
<h3 id="定义Login组件"><a href="#定义Login组件" class="headerlink" title="定义Login组件"></a>定义Login组件</h3><ul>
<li>在login.component.ts文件中定义Login组件</li>
</ul>
<figure class="highlight typescript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">import</span> &#123; Component &#125; from <span class="string">'@angular/core'</span>;</div><div class="line"></div><div class="line">@Component(&#123;</div><div class="line">  selector: <span class="string">'login'</span>, <span class="comment">// 设置元素选择器，&lt;login&gt;&lt;/login&gt;</span></div><div class="line">  styleUrls: [<span class="string">'./login.style.css'</span>], <span class="comment">// 样式文件引入</span></div><div class="line">  templateUrl: <span class="string">'./login.template.html'</span> <span class="comment">// 模板文件引入</span></div><div class="line">&#125;)</div><div class="line"><span class="keyword">export</span> <span class="keyword">class</span> Login &#123;</div><div class="line">  <span class="comment">// 定义并初始化用户名和密码以及其类型</span></div><div class="line">  name: <span class="built_in">string</span> = <span class="string">''</span>;</div><div class="line">  password: <span class="built_in">string</span> = <span class="string">''</span>;</div><div class="line"></div><div class="line">  <span class="comment">// 定义提交表单事件</span></div><div class="line">  submitForm(name, password) &#123;</div><div class="line">    <span class="built_in">console</span>.log(name, password);</div><div class="line">  &#125;</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<h3 id="输出Login组件"><a href="#输出Login组件" class="headerlink" title="输出Login组件"></a>输出Login组件</h3><ul>
<li>在index.ts文件中，我们输出Login组件</li>
</ul>
<figure class="highlight typescript"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">export</span> * from <span class="string">'./login.component'</span>;</div></pre></td></tr></table></figure>
<h2 id="结束语"><a href="#结束语" class="headerlink" title="结束语"></a>结束语</h2><hr>
<p>本骚年也是Angular2的初体验者，如果小伙伴们有好的资源请千万千万要分享呀。<br><a href="https://github.com/godbasin/godbasin.github.io/tree/blog-codes/angular2-notes/2-create-login" target="_blank" rel="external">此处查看项目代码（仅包含src部分）</a><br><a href="http://angular2-notes.godbasin.com/2-create-login/index.html" target="_blank" rel="external">此处查看页面效果</a></p>
  
		
		<p style="margin-top:50px;">查看Github有更多内容噢：<a href="https://github.com/godbasin">https://github.com/godbasin</a></p>
	</div>
	<img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/2code2.jpg" width="200" height="200" style="display:block;margin: 0 auto;" />
	<p style="text-align: center;margin-top: 10px;margin-bottom: 20px;">码生艰难，写文不易，给我家猪囤点猫粮了喵~</p>
	<div class="author-right">
  		<p>作者：被删</p>
  		<p>出处：<a href="https://godbasin.github.io">https://godbasin.github.io</a></p>
  		<p>本文版权归作者所有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。</p>
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  <ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#根据产品规划划分模块"><span class="toc-number">1.</span> <span class="toc-text">根据产品规划划分模块</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#主要页面逻辑"><span class="toc-number">1.1.</span> <span class="toc-text">主要页面逻辑</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#定义登录组件"><span class="toc-number">1.2.</span> <span class="toc-text">定义登录组件</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#添加路由"><span class="toc-number">1.3.</span> <span class="toc-text">添加路由</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#编写Login组件"><span class="toc-number">2.</span> <span class="toc-text">编写Login组件</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#添加模板"><span class="toc-number">2.1.</span> <span class="toc-text">添加模板</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#添加样式"><span class="toc-number">2.2.</span> <span class="toc-text">添加样式</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#定义Login组件"><span class="toc-number">2.3.</span> <span class="toc-text">定义Login组件</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#输出Login组件"><span class="toc-number">2.4.</span> <span class="toc-text">输出Login组件</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#结束语"><span class="toc-number">3.</span> <span class="toc-text">结束语</span></a></li></ol>
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